It would be nice to see more manufacturers standardize where it makes sense.
- Fill Adapters. Do you really need your own fill probe? Will a quick connect work? Then use that. I get not all designs work with one but I think Daystate and FX have shown you can make them work with most designs. It's frustrating to have to keep multiple fill probes around when one quick connect will work. It's even more frustrating when you realize you gone out to shoot and left the fill probe at home.
- Thumb safeties. Is making a safety on the left hand side that your thumb can reach beyond your engineering? Again, not every design can accommodate it but most can. BSA seems to flip flop their safeties from the left to the right for no reason. Most of us are right handed so put the safety on the left where our thumb goes to it naturally. Again I'll highlight Daystate as having done this right. It's the most natural safety I've ever used. As a subnote, if you are going to put on a safety, make it reliable. Let's never again have the Airforce safety fiasco. Personally, I'd rather a gun have no safety rather than a poor, unreliable one. I've seen guns with safeties on the trigger. No one on the design team saw the problem with this?
- Use a common pellet for stating your FPS numbers. JSB's are universally regarded as the best pellets. While they may not be the best for a particular application, many people have them because they work great in one of the guns they own. Some manufacturers have started to do this and it's great to know what expectations should be. (Yeah, the cheaper guns all claim their gun will shoot a .177 at near light speed and it's a worthless marketing tactic designed to impress the airgun ignorant. These figures are meaningless to anyone with a modicum of knowledge. You are doing your customers a disservice when you don't disclose what pellet you use to test for stated speed .177 - 8.44gr .22 - 18.13gr .25 - 25.39gr Simple as can be.
- Rails - If you are going to build in a rail, make it the standard size. I've seen both airguns and powder burners release guns with Weaver like rails that weren't actually Weaver spec-ed rails. No one wants to make alterations to their new gun to make their attachment work on it.
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This is just what I can think of. I am sure some people will have more.